Portion of a footwear sole



FIG. 1 is a bottom perspective view of a portion of a footwear sole, showing my new design;

FIG. 2 is a right side elevational view thereof;

FIG. 3 is a left side elevational view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a front elevational view thereof; and,

FIG. 7 is a rear elevational view thereof.

The broken line showing a footwear upper throughout the views illustrates the portion of the design that forms no part of the claim. The broken rectangular line in FIG. 4 forms the boundary of the design, with the broken line, and the area within, forming no part of the claim. 

The ornamental design for a portion of a footwear sole, as shown and described. 